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Recent advances in biosensors, bioelectronics, and system integration allow the development of wristband-type devices for health and performance monitoring of athletes. Although these devices provide adequate sensing outputs, they suffer from signal loss due to improper contact of a rigid sensor with the skin. In addition, when a rubber band tightly secures the sensor to the skin, the gap between sensor and skin causes inevitable motion artifacts, resulting in corrupted data. Consequently, the rigidity and bulky form factor of the existing devices are not suitable for a practical use since athletes typically go through strenuous activities during training and matches. Here, we introduce a soft, wearable flexible hybrid electronics (WFHE) with integrated flexible sensors and circuits in an ultrathin, low-modulus elastomer. The thin-film bioelectronic system avoids the use of bulky, rigid sensors, while providing negligible …